Help me with this math plz
2 answers:
You might be interested in
Answer:
a = 15
Step-by-step explanation:
Substitute b = 12 , a = 9 into the equation
12 =
12 = ← square both sides
144 = a² - 81 ( add 81 to both sides )
225 = a² ( take square root of both sides )
± = a , then
a = ± 15
a > 0 , so a = 15